Hydraulic valve device

E - Fixed Constructions – 02 – F

Patent

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Details

E02F 9/22 (2006.01) F15B 13/01 (2006.01)

Patent

CA 2686775

The invention relates to Hydraulic valve device comprising a first engine port (L) and a second engine port (N) to a double acting hydraulic motor (D), in particular a double acting hydraulic cylinder, a tank (T), and a pump (I), a hand valve (H), which is arranged such that it connects the engine ports (L, N) to the tank (T) and the pump (I), and which hand valve (H) has two open positions, wherein the pump (I) in the first open position via a line (F) is connected to the first engine port (L) and the tank (T) via a line (G) is connected to the second engine port (N), and wherein the pump (I) in the second open position via the line (G) is connected to the second engine port (N) and the tank (T) via the line (F) is connected to the first engine port (L), and a first nonreturn valve (IA, 8), which is arranged between the pump (I) and the second engine port (N) and opens towards the second engine port (N). Further, a piston (2), which by means of the load pressure in the first engine port (L) via a line (E) governs the first nonreturn valve (IA, 8), such that it is kept closed as long as the pump pressure does not exceed said load pres¬ sure, and a second nonreturn valve (3), which is arranged such that it, as long as the hand valve (H) is in its first open position, connects the first engine port (L) to the second engine port (N) and opens in direction towards the second engine port (N).

La présente invention concerne une soupape hydraulique comprenant un premier orifice de moteur (L) et un second orifice de moteur (N) vers un moteur hydraulique à double effet (D), en particulier un vérin hydraulique à double effet, un réservoir (T), et une pompe (I), une soupape à main (H), qui est agencée de telle sorte qu'elle relie les orifices de moteur (L, N) au réservoir (T) et à la pompe (I), et laquelle soupape à main (H) a deux positions d'ouverture, la pompe (I), dans la première position d'ouverture via une ligne (F), étant reliée au premier orifice de moteur (L) et le réservoir (T), via une ligne (G), étant relié au second orifice de moteur (N), et la pompe (I) dans la seconde position d'ouverture via la ligne (G), étant reliée au second orifice de moteur (N) et le réservoir (T) via la ligne (F), étant relié au premier orifice de moteur (L), et un premier clapet antiretour (IA, 8), qui est agencé entre la pompe (I) et le second orifice de moteur (N) et s'ouvre en direction du second orifice de moteur (N). De plus, un piston (2) qui, par l'intermédiaire de la pression de charge dans le premier orifice de moteur (L) via une ligne (E), commande le premier clapet antiretour (IA, 8), de sorte qu'il soit maintenu fermé aussi longtemps que la pression de pompe ne dépasse pas ladite pression de charge, et un second clapet antiretour (3), qui est agencé de telle sorte, pour autant que la soupape à main (H) soit dans sa première position d'ouverture, relie le premier orifice de moteur (L) au second orifice de moteur (N) et s'ouvre en direction du second orifice de moteur (N).

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